... improve gas mileage up to 10%improve car handling.How to useDetermine the proper pressure for your tires by checking ... pressure of your tire will be displayed.Notes:For accuracy, check pressure when tires are cold. ... gas mileage, handling, braking and durability.Caution:To avoid the possibility of eye injury, eye protection ... of gauge. pencil air gauge, auto air pressure gauge, 3 versions, SMT1192